Brake lining machine



A ril 16, 1935. H. THOMASON BRAKE LINING MACHINE Filed July 30, 1931 2 Sheets-Sheet 1 r Q W3 P 0 0 E2 W 4 8 2 2 2 a 3 1:

April 16, 1935. H. THOMASON BRAKE LINING MACHINE Filed July 30, 1931 2 Sheets-Sheet 2 IIE 4 Patented Apr. 16, 1935 I UNITED STATES PATENT QFFiCE.

BRAKE LINENG MACHENE .Hjalmar 'I homason, Los Angeles, Calif.

Application July 30, 1931, Serial No. 554,007

4 Claims.

enumerated, will be set forth in the following.

description of the inventions particular embodiment which is illustrated in the drawings accompanying and forming a part of the specification,

Referring to the drawings:

Fig. l is a front elevation of a brake lining machine embodying the principles of the present invention.

Fig. 2 is a side elevation, the direction of View being indicated by the arrow 2 of Fig. 1.

Fig. 3 is a top plan view, the direction of view being indicated by the arrow 3 of Fig. 1, and a portion of the figure being broken away to reduce its size.

Fig. 4 is an enlarged vertical sectional view taken through the grinding and drilling mechanism upon the line 4-4 of Fig. 3, with the direction of view as indicated.

My improved brake lining machine is mounted upon a single standard, indicated in its entirety at I6. This standard comprises a tubular body portion I! which is split upwards from its lower end to provide three legs I8 which are sprung outwards away from each other so that they diverge downwards from the lower end of the body I I. Gusset plates 20 are rigidly attached to the legs I8 adjacent the body 51.

A grinding mechanism 91, is supported upon a laterally extending table 98 which is rigidly clamped upon the body portion I! of the standard I6 by a releasable clamp 99 (see- Fig. 1). An electric motor IBI is rigidly mounted upon the under side of the table 93, with the shaft of the motor IIJI disposed vertically. The spindle I02 of a grinder I03 is secured coaxially to the shaft of the motor IDI, and extends upwards through the table 98. A tubular head I04 is removably receivable upon the spindle IE2 and is adapted to be clamped rigidly thereupon by means of a disk- I06 having a screw IUI extending there through. The outer surface of the head I04 is covered with suitable abrasive such as a sheet of emery cloth I03.

Means are provided for guiding a brake shoe against the grinder 503. A brake shoe guide HI having a boss II 2 is adapted to be mounted for 5 pivotal movement upon the table 98 by meansof a pivot pin H3 rigid with the table 98 which is adapted to be received within a suitable hole in the boss H2. The guide III comprises a flat arcuate plate I I4 having a flange or guide wall I i 6 extending upwards from the outer edge thereof. An opening II! is provided in the flange ME in registry with the grinder I 83, so that the grinder MS may be caused to enter the notch II? by swinging the guide I II toward the grinder. Preferably, a plurality of guides III of assorted sizes is provided, it being intended that a guide be selected. whose curvature coincides with that of the brake shoe to be ground. This permits the brake shoe with the newly applied lining thereupon to be supported upon the plate H4, and pressing against the inner surface of the flange H5. The shoe should then be rotated about the center of its own are so as to cause its entire length to come into engagement with the grinder I93 while the grinder is being rapidly rotated as a result of the energization of the motor IUI. The depth to which the grinder I63 enters the notch II! is adjustable by means of a screw H8 threaded through a boss Ill! upon the table 98, and a coil spring I2I under tension between the table 98 and the guide II I holds the guide against the screw II 8.

The flange H6 of any particular arcuate'template guide HI represents the true cylindrical surface that the wearing surface of a brake band to be tested and ground should have. When the brake band is fitted against this flange the high spots contact with the flange and when the brake lining with the shoe on which it is attached is moved in an arc and kept pressed against the flange IIB the high spots may be ground oif by the grinder. The arcuate guide is readily adjustable to grind either small or large sections from the brake band, then as the band is properly shaped it will have a close contact fit with the flange II6.

It is to be understood that the details of the invention as herein disclosed, are subject to alteration within the spirit or scope of the appended claims.

I claim:

1. In a brake grinding machine, a grinder, an arcuate guide wall for guiding an arcuate brake shoe in rotary motion about the center of its own are, said guide wall having an opening and said grinder being disposed partially within said opening to engage a brake shoe within said guide wall, said guide wall being movable whereby that portion of the guide wall having the opening therein may be moved towards and away from said grinder, and means for holding said guide wall in selected position.

2. In a brake grinding machine a rotatable grinder, an arcuate guide wall for guiding an arcuate brake shoe in rotary motion about the center of its own arc, said guide wall having an opening and said grinder being disposed partially within said opening to engage a brake shoe within said guide wall, a pivot for said guide wall, said pivot being parallel to the axis of the grinder and located at one side 01. the opening and means for holding said guide wall in selected positions.

3. In a brake grinding machine, as claimed in claim 2, the means for holding the guide wall in selected position comprising an adjusting screw positioned to contact with the outside of the guide wall and a spring connected to the guide wall and pulling said wall into contact with said screw.

4. In a brake grinding machine a flat plate, an arcuate guide flange extending upwardly from one end thereof to guide an arcuate brake shoe resting on the plate in rotary motion above the center ofthe arc described thereby, saidfiange having an opening, a cylindrical grinder having its axis concentric to that of the flange and disposed partly within said opening to engage a brake shoe within said guide, means to rotate the grinder, a pivotfor the plate parallel to the axis of the grinder and means to turn the arcuate plate and guide flange on its pivot to vary the depth to which the grinder extends into said opening.

HJALMAR 'I'HOMASON. 

